| Cover Page - shares | 6 Months Ended | |
| Jun. 30, 2020 | Jul. 27, 2020 | |
| Cover [Abstract] | ||
| Document Type | 10-Q/A | |
| Amendment Flag | true | |
| Document Fiscal Year Focus | 2020 | |
| Document Period End Date | Jun. 30, 2020 | |
| Trading Symbol | WETF | |
| Document Fiscal Period Focus | Q2 | |
| Entity Registrant Name | WisdomTree Investments, Inc. | |
| Entity Central Index Key | 0000880631 | |
| Current Fiscal Year End Date | --12-31 | |
| Entity Filer Category | Large Accelerated Filer | |
| Entity Small Business | false | |
| Entity Emerging Growth Company | false | |
| Entity Shell Company | false | |
| Entity Common Stock, Shares Outstanding | 149,875,749 | |
| Document Transition Report | false | |
| Document Quarterly Report | true | |
| Entity Current Reporting Status | Yes | |
| Entity Interactive Data Current | Yes | |
| Title of 12(b) Security | Common Stock | |
| Security Exchange Name | NASDAQ | |
| Entity File Number | 001-10932 | |
| Entity Address, Address Line One | 245 Park Avenue, 35th Floor | |
| Entity Address, City or Town | New York | |
| Entity Address, State or Province | NY | |
| Entity Address, Postal Zip Code | 10167 | |
| Entity Incorporation, State or Country Code | DE | |
| Entity Tax Identification Number | 13-3487784 | |
| City Area Code | 212 | |
| Local Phone Number | 801-2080 | |
| Amendment Description | WisdomTree Investments, Inc. is filing this Amendment No. 1 on Form 10-Q/A to its Quarterly Report on Form 10-Q for the quarter ended June 30, 2020, filed with the Securities and Exchange Commission on August 7, 2020, solely to correct a typographical error on the cover page. The cover page of the Form 10-Q incorrectly stated that as of July 27, 2020, there were 145,875,749 shares of our common stock outstanding. The cover page of this Form 10-Q/A correctly states that as of July 27, 2020, there were 149,875,749 shares of our common stock outstanding.This Form 10-Q/A should be read in conjunction with the Form 10-Q, which continues to speak as of the date of the Form 10-Q. Except as specifically noted above, this Form 10-Q/A does not modify or update disclosures in the Form 10-Q. Accordingly, this Form 10-Q/A does not reflect events occurring after the filing of the Form 10-Q or modify or update any related or other disclosures.Unless the context requires otherwise, references to “WisdomTree,” the “Company,” “we,” “our,” “us” or like terms refer to WisdomTree Investments, Inc. and its subsidiaries. |
